CVE-2026-57077

HIGHPre-NVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

Score 7.7 from GitHub Security Advisory (severity: HIGH) published 2026-07-17. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len.

In the bundled libsyck newline_len and is_newline dereference the scan pointer, and the following byte for a "\r\n" pair, with no NUL-terminator or bounds check. During block-scalar lexing at a document boundary the scan runs one byte past the heap lexer buffer. This is an incomplete fix of CVE-2025-11683, on a lexer path the earlier fix did not cover.

Any caller that runs Load or LoadFile on an untrusted document with a block scalar at a document boundary reaches the over-read.

CVSS v3
7.7
EG Score
7.7(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity77% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

July 16, 2026

Last Modified

July 17, 2026

Advisory Details (3)

Auto-updated Jul 17, 2026
No patch confirmed yet.
generic
https://www.cve.org/CVERecord?id=CVE-2025-11683
generic
https://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d8b.patch
generic

Changes - metacpan.org

https://metacpan.org/release/TODDR/YAML-Syck-1.47/changes

Vendor Advisories for CVE-2026-57077(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libyaml-syck-perl1.34-1 ... 1.47-1 (9 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libyaml-syck-perl1.34-2 ... 1.47-1 (9 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libyaml-syck-perl1.34-2 ... 1.47-1 (9 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libyaml-syck-perl1.34-2 ... 1.36-3 (6 versions)1.47-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 23× in last 7d / 110× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 603 total refreshes for this CVE.

  1. 2026-08-30 03:28 UTCEG score recompute
  2. 2026-08-30 03:28 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-28 01:49 UTCEG score recompute
  6. 2026-08-28 01:49 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 12:24 UTCGHSA enrichment
  9. 2026-08-26 23:51 UTCEG score recompute
  10. 2026-08-26 23:51 UTCGHSA enrichment
  11. 2026-08-26 14:46 UTCEPSS rescore
  12. 2026-08-26 11:57 UTCGHSA enrichment
  13. 2026-08-25 23:51 UTCEG score recompute
  14. 2026-08-25 23:50 UTCGHSA enrichment
  15. 2026-08-25 13:49 UTCEPSS rescore
  16. 2026-08-25 11:31 UTCGHSA enrichment
  17. 2026-08-24 23:39 UTCEG score recompute
  18. 2026-08-24 23:39 UTCGHSA enrichment
  19. 2026-08-24 11:46 UTCEG score recompute
  20. 2026-08-24 11:45 UTCGHSA enrichment
  21. 2026-08-23 23:52 UTCGHSA enrichment
  22. 2026-08-23 12:00 UTCEG score recompute
  23. 2026-08-23 12:00 UTCGHSA enrichment
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-23 00:07 UTCGHSA enrichment
Show 75 more
  1. 2026-08-22 12:14 UTCGHSA enrichment
  2. 2026-08-21 23:54 UTCEG score recompute
  3. 2026-08-21 23:54 UTCGHSA enrichment
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 12:01 UTCGHSA enrichment
  6. 2026-08-21 00:08 UTCEG score recompute
  7. 2026-08-21 00:08 UTCGHSA enrichment
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-20 12:15 UTCGHSA enrichment
  10. 2026-08-19 23:50 UTCEG score recompute
  11. 2026-08-19 23:50 UTCGHSA enrichment
  12. 2026-08-19 17:04 UTCEPSS rescore
  13. 2026-08-19 11:51 UTCGHSA enrichment
  14. 2026-08-18 23:50 UTCEG score recompute
  15. 2026-08-18 23:50 UTCGHSA enrichment
  16. 2026-08-18 13:48 UTCEPSS rescore
  17. 2026-08-18 11:56 UTCGHSA enrichment
  18. 2026-08-18 00:03 UTCEG score recompute
  19. 2026-08-18 00:02 UTCGHSA enrichment
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-17 12:09 UTCGHSA enrichment
  22. 2026-08-17 00:14 UTCEG score recompute
  23. 2026-08-17 00:14 UTCGHSA enrichment
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 12:21 UTCEG score recompute
  26. 2026-08-16 12:21 UTCGHSA enrichment
  27. 2026-08-16 02:14 UTCEPSS rescore
  28. 2026-08-16 00:29 UTCGHSA enrichment
  29. 2026-08-15 12:36 UTCEG score recompute
  30. 2026-08-15 12:36 UTCGHSA enrichment
  31. 2026-08-15 01:30 UTCEPSS rescore
  32. 2026-08-15 00:43 UTCGHSA enrichment
  33. 2026-08-14 12:51 UTCGHSA enrichment
  34. 2026-08-14 00:58 UTCEG score recompute
  35. 2026-08-14 00:58 UTCGHSA enrichment
  36. 2026-08-13 22:00 UTCEPSS rescore
  37. 2026-08-13 13:05 UTCGHSA enrichment
  38. 2026-08-13 01:12 UTCEG score recompute
  39. 2026-08-13 01:12 UTCGHSA enrichment
  40. 2026-08-12 13:51 UTCEPSS rescore
  41. 2026-08-12 13:20 UTCGHSA enrichment
  42. 2026-08-12 01:27 UTCEG score recompute
  43. 2026-08-12 01:27 UTCGHSA enrichment
  44. 2026-08-11 13:35 UTCGHSA enrichment
  45. 2026-08-11 01:43 UTCEG score recompute
  46. 2026-08-11 01:43 UTCGHSA enrichment
  47. 2026-08-11 00:00 UTCEPSS rescore
  48. 2026-08-10 13:50 UTCGHSA enrichment
  49. 2026-08-10 01:57 UTCGHSA enrichment
  50. 2026-08-09 14:04 UTCEG score recompute
  51. 2026-08-09 14:04 UTCGHSA enrichment
  52. 2026-08-09 13:46 UTCEPSS rescore
  53. 2026-08-09 02:12 UTCEG score recompute
  54. 2026-08-09 02:12 UTCGHSA enrichment
  55. 2026-08-08 16:37 UTCEPSS rescore
  56. 2026-08-08 14:20 UTCGHSA enrichment
  57. 2026-08-08 02:27 UTCEG score recompute
  58. 2026-08-08 02:27 UTCGHSA enrichment
  59. 2026-08-07 14:34 UTCGHSA enrichment
  60. 2026-08-07 02:41 UTCGHSA enrichment
  61. 2026-08-06 14:48 UTCEG score recompute
  62. 2026-08-06 14:48 UTCGHSA enrichment
  63. 2026-08-06 13:47 UTCEPSS rescore
  64. 2026-08-06 02:52 UTCEG score recompute
  65. 2026-08-06 02:52 UTCGHSA enrichment
  66. 2026-08-05 19:17 UTCEPSS rescore
  67. 2026-08-05 14:59 UTCGHSA enrichment
  68. 2026-08-05 00:54 UTCGHSA enrichment
  69. 2026-08-04 13:00 UTCEG score recompute
  70. 2026-08-04 13:00 UTCGHSA enrichment
  71. 2026-08-04 10:39 UTCEPSS rescore
  72. 2026-08-03 23:50 UTCGHSA enrichment
  73. 2026-08-03 11:57 UTCEG score recompute
  74. 2026-08-03 11:57 UTCGHSA enrichment
  75. 2026-08-03 10:36 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-57077?
CVE-2026-57077 is a high vulnerability published on July 16, 2026. YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len. In the bundled libsyck newlinelen and isnewline dereference the scan pointer, and the following byte for a "\r\n" pair, with no NUL-terminator or bounds check. During block-scalar…
When was CVE-2026-57077 disclosed?
CVE-2026-57077 was first published in the National Vulnerability Database on July 16, 2026, with the most recent update on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57077 actively exploited?
CVE-2026-57077 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.3% of all scored CVEs.
What is the CVSS score of CVE-2026-57077?
CVE-2026-57077 has a CVSS v3.1 base score of 7.7 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-57077?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57077, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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