CVE-2026-71488

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (48th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 0.6.0 until 2.9.0, specially crafted Markdown lines can cause the parser to have quadratic time complexity when converting, because several parsing paths repeatedly rescan growing portions of a line to translate between character positions and byte positions, and the Autolink extension can also copy and validate the remaining line at every URL-like prefix, allowing an attacker who can submit Markdown for conversion to consume disproportionate CPU time with a comparatively small request. This issue is fixed in 2.9.0.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 6, 2026

Last Modified

September 10, 2026

Advisory Details (5)

Auto-updated Aug 6, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Quadratic-time denial of service when parsing crafted Markdown · Advisory · thephpleague/commonmark · GitHub

https://github.com/thephpleague/commonmark/security/advisories/GHSA-2q4p-g7hv-5rgv
github_release Patch Available

2.9.0

Patch available: thephpleague/commonmark 2.9.0

https://github.com/thephpleague/commonmark/releases/tag/2.9.0
github_commit Patch Available

commit c97b02e5e652 (thephpleague/commonmark)

Patch available: thephpleague/commonmark 2.9.0 (contains commit c97b02e5e652)

https://github.com/thephpleague/commonmark/commit/c97b02e5e652b992033b93ba5d6182f706343fc6
github_commit Patch Available

commit a70979ea0d7d (thephpleague/commonmark)

Patch available: thephpleague/commonmark 2.9.0 (contains commit a70979ea0d7d)

https://github.com/thephpleague/commonmark/commit/a70979ea0d7d3377bd7127536748454a922bf5eb
github_commit Patch Available

commit a6ef6cdc308d (thephpleague/commonmark)

Patch available: thephpleague/commonmark 2.9.0 (contains commit a6ef6cdc308d)

https://github.com/thephpleague/commonmark/commit/a6ef6cdc308dfa39a34239c35818e75892a0e6a8

Vendor Advisories for CVE-2026-71488(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:12(1)
PackageVulnerable rangeFix by version rangeDependents
php-league-commonmark2.10.0-1 ... 2.9.0-1 (25 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
php-league-commonmark2.10.0-1 ... 2.9.0-1 (13 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
php-league-commonmark2.7.0-1 ... 2.8.3-1 (8 versions)
  • every version up to 2.9.0-1: fixed in 2.9.0-1
—
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
league/commonmark0.10.0 ... 2.8.3 (131 versions)
  • 0.6.0 up to 2.9.0: fixed in 2.9.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 43× 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.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-71488?
CVE-2026-71488 is a high vulnerability published on August 6, 2026. league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 0.6.0 until 2.9.0, specially crafted Markdown lines can cause the parser to have quadratic time complexity when converting, because several parsing paths repeatedly rescan growing portions of a line to translate…
When was CVE-2026-71488 disclosed?
CVE-2026-71488 was first published on August 6, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71488 actively exploited?
CVE-2026-71488 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71488?
CVE-2026-71488 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71488?
A fix for CVE-2026-71488 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-71488 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-71488

Explore →

Is Your Infrastructure Affected by CVE-2026-71488?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs