CVE-2018-18751

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in GNU gettext 0.19.8. There is a double free in default_add_message in read-catalog.c, related to an invalid free in po_gram_parse in po-gram-gen.y, as demonstrated by lt-msgfmt.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
90.1%
KEV
Not listed

Published

October 29, 2018

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Jun 7, 2026
Patch available. Sources: redhat.
generic

POCs/Bin/Tools-gettext-0.19.8.1/heapcorruption at master · CCCCCrash/POCs · GitHub

https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/heapcorruption
generic

POCs/Bin/Tools-gettext-0.19.8.1/doublefree at master · CCCCCrash/POCs · GitHub

https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/doublefree
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2019:3643

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgettextpo0 (0.19.7-2ubuntu3.1) @ xenial2026-05-28ubuntu
ubuntugettext (0.18.1.1-5ubuntu3.1) @ precise2026-05-28ubuntu
redhatgettext-0:0.19.8.1-3.el7_62020-07-07redhat
redhatgettext-0:0.19.8.1-3.el7_72020-06-12redhat
redhatgettext-0:0.19.8.1-3.el72020-03-31redhat
redhatgettext-0:0.19.8.1-17.el82019-11-05redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 48× 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 102 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2018-18751?
CVE-2018-18751 is a critical vulnerability published on October 29, 2018. An issue was discovered in GNU gettext 0.19.8. There is a double free in defaultaddmessage in read-catalog.c, related to an invalid free in pogramparse in po-gram-gen.y, as demonstrated by lt-msgfmt.
When was CVE-2018-18751 disclosed?
CVE-2018-18751 was first published in the National Vulnerability Database on October 29, 2018, 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-2018-18751 actively exploited?
CVE-2018-18751 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-18751?
CVE-2018-18751 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-18751?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-18751, 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.

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