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CVE-2026-4177

YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter. The heap overflow occurs when class names exceed the initial 512-byte allocation. The base64 decoder could read past the buffer end on trailing newlines. strtok mutated n->type_id in place, corrupting shared node data. A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was lea
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:88aa1e5305999ec870c2229d634f86c2155b6410679242cd16dfa5dc222bdd08
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 4 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:8::crb"],"defaultStatus":"affected","packageName":"perl-YAML-Syck","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:1.30-6.el8_10","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:rhel_els:7"],"defaultStatus":"affected","packageName":"perl-YAML-Syck","product":"Red Hat Enterprise Linux 7 Extended Lifecycle Support","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:1.27-3.el7_9.1","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/affected/0

{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"YAML-Syck","product":"YAML::Syck","programFiles":["emitter.c","handler.c","perl_common.h","perl_syck.h"],"programRoutines":[{"name":"YAML::Syck::yaml_syck_emitter_handler()"},{"name":"YAML::Syck::syck_base64dec()"},{"name":"YAML::Syck::yaml_syck_parser_handler()"},{"name":"YAML::Syck::syck_hdlr_add_anchor()"}],"repo":"https://github.com/cpan-authors/YAML-Syck","vendor":"TODDR","versions":[{"lessThanOrEqual":"1.36","status":"affected","version":"0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"unknown","packageName":"perl-YAML-Syck","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/affected/2
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/metrics/1/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/1/metrics/0/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-122","description":"CWE-122 Heap-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-120","description":"Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/problemTypes/0/descriptions/0

Affected products and versions

4 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:8::crb"],"defaultStatus":"affected","packageName":"perl-YAML-Syck","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:1.30-6.el8_10","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:rhel_els:7"],"defaultStatus":"affected","packageName":"perl-YAML-Syck","product":"Red Hat Enterprise Linux 7 Extended Lifecycle Support","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:1.27-3.el7_9.1","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/affected/0
{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"YAML-Syck","product":"YAML::Syck","programFiles":["emitter.c","handler.c","perl_common.h","perl_syck.h"],"programRoutines":[{"name":"YAML::Syck::yaml_syck_emitter_handler()"},{"name":"YAML::Syck::syck_base64dec()"},{"name":"YAML::Syck::yaml_syck_parser_handler()"},{"name":"YAML::Syck::syck_hdlr_add_anchor()"}],"repo":"https://github.com/cpan-authors/YAML-Syck","vendor":"TODDR","versions":[{"lessThanOrEqual":"1.36","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"unknown","packageName":"perl-YAML-Syck","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/affected/2

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/1/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-122","description":"CWE-122 Heap-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-120","description":"Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/problemTypes/0/descriptions/0

Source references

8 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/03/16/6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/0/references/0
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:6470"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/references/4
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:8311"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-4177"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/references/0
{"name":"RHBZ#2448277","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2448277"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/references/1
{"tags":["patch"],"url":"https://github.com/cpan-authors/YAML-Syck/commit/e8844a31c8cf0052914b198fc784ed4e6b8ae69e.patch"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/cna/references/0
{"tags":["release-notes"],"url":"https://metacpan.org/release/TODDR/YAML-Syck-1.37_01/changes#L21"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/cna/references/1
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4177.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9eef8f4b4e9ab70717309b36cc3746ca63c1af5280dd9ded8d649f022ce289de · sha256:56bb6b49b3959b33… · /containers/adp/2/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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