CVE-2018-20796

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.8%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

In the GNU C Library (aka glibc or libc6) through 2.29, check_dst_limits_calc_pos_1 in posix/regexec.c has Uncontrolled Recursion, as demonstrated by '(\227|)(\\1\\1|t1|\\\2537)+' in grep.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
41
EG Risk 41/100CISA 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%
Exploitation6% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
5.8%
EPSS %ILE
92nd
KEV
Not listed

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

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

February 26, 2019

Last Modified

November 21, 2024

References (10)

Vendor Advisories for CVE-2018-20796(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 rangeFix by version rangeDependents
glibc2.31-13 ... 2.43-2 (208 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
glibc2.36-10~0 ... 2.44-1 (130 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
glibc2.41-12 ... 2.44-1 (36 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
glibc2.41-12 ... 2.44-1 (32 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 26× 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 169 total refreshes for this CVE.

  1. 2026-10-09 20:02 UTCEPSS rescore
  2. 2026-10-08 16:36 UTCEPSS rescore
  3. 2026-10-07 23:42 UTCEPSS rescore
  4. 2026-10-06 15:12 UTCEPSS rescore
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  10. 2026-09-30 09:59 UTCEG score recompute
  11. 2026-09-28 13:45 UTCEPSS rescore
  12. 2026-09-28 12:38 UTCOSV refresh
  13. 2026-09-27 13:40 UTCEPSS rescore
  14. 2026-09-26 15:53 UTCEPSS rescore
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  1. 2026-09-11 09:32 UTCEPSS rescore
  2. 2026-09-08 16:34 UTCOSV refresh
  3. 2026-09-06 13:43 UTCEPSS rescore
  4. 2026-09-05 15:24 UTCEPSS rescore
  5. 2026-09-04 13:56 UTCEPSS rescore
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  8. 2026-09-01 13:49 UTCEPSS rescore
  9. 2026-09-01 03:32 UTCEPSS rescore
  10. 2026-08-28 21:36 UTCEPSS rescore
  11. 2026-08-27 14:21 UTCEPSS rescore
  12. 2026-08-26 14:42 UTCEPSS rescore
  13. 2026-08-25 13:44 UTCEPSS rescore
  14. 2026-08-22 02:11 UTCOSV refresh
  15. 2026-08-21 23:45 UTCEPSS rescore
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  18. 2026-08-18 13:44 UTCEPSS rescore
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  20. 2026-08-16 14:51 UTCEPSS rescore
  21. 2026-08-16 02:10 UTCEPSS rescore
  22. 2026-08-15 01:26 UTCEPSS rescore
  23. 2026-08-13 21:56 UTCEPSS rescore
  24. 2026-08-12 13:46 UTCEPSS rescore
  25. 2026-08-09 13:43 UTCEPSS rescore
  26. 2026-08-08 16:32 UTCEPSS rescore
  27. 2026-08-07 16:23 UTCEPSS rescore
  28. 2026-08-06 13:42 UTCEPSS rescore
  29. 2026-08-06 06:24 UTCOSV refresh
  30. 2026-08-05 19:13 UTCEPSS rescore
  31. 2026-08-04 15:05 UTCEPSS rescore
  32. 2026-08-02 02:23 UTCEPSS rescore
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  36. 2026-07-28 15:32 UTCEPSS rescore
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  40. 2026-07-24 14:14 UTCEPSS rescore
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  42. 2026-07-23 14:15 UTCEPSS rescore
  43. 2026-07-23 01:35 UTCEG score recompute
  44. 2026-07-22 22:15 UTCEG score recompute
  45. 2026-07-22 14:05 UTCEPSS rescore
  46. 2026-07-21 15:22 UTCEPSS rescore
  47. 2026-07-20 21:32 UTCOSV refresh
  48. 2026-07-20 17:04 UTCEPSS rescore
  49. 2026-07-20 17:04 UTCEPSS rescore
  50. 2026-07-19 14:28 UTCEPSS rescore
  51. 2026-07-19 02:26 UTCEPSS rescore
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  53. 2026-07-16 16:59 UTCEPSS rescore
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  55. 2026-07-15 16:55 UTCEPSS rescore
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  63. 2026-07-11 08:24 UTCEPSS rescore
  64. 2026-07-09 19:06 UTCEPSS rescore
  65. 2026-07-08 15:11 UTCEPSS rescore
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  68. 2026-07-06 16:24 UTCEPSS rescore
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  70. 2026-07-06 02:20 UTCEPSS rescore
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  72. 2026-07-04 06:28 UTCEPSS rescore
  73. 2026-07-04 06:28 UTCEPSS rescore
  74. 2026-07-03 16:56 UTCOSV refresh
  75. 2026-07-02 16:54 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-20796?
CVE-2018-20796 is a high vulnerability published on February 26, 2019. In the GNU C Library (aka glibc or libc6) through 2.29, checkdstlimitscalcpos_1 in posix/regexec.c has Uncontrolled Recursion, as demonstrated by '(\227|)(\\1\\1|t1|\\\2537)+' in grep.
When was CVE-2018-20796 disclosed?
CVE-2018-20796 was first published on February 26, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-20796 actively exploited?
CVE-2018-20796 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.8% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-20796?
CVE-2018-20796 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2018-20796?
A fix for CVE-2018-20796 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2018-20796 are linked in the Vendor Advisories panel on this page.

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