CVE-2017-17458

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 17.2%, top 5% of all CVEs by exploit prediction. 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, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 9.8Exploit: NoneExposed: 0

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

In Mercurial before 4.4.1, it is possible that a specially malformed repository can cause Git subrepositories to run arbitrary code in the form of a .git/hooks/post-update script checked into the repository. Typical use of Mercurial prevents construction of such repositories, but they can be created programmatically.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
92.8%
KEV
Not listed

Published

December 7, 2017

Last Modified

May 13, 2026

Advisory Details (9)

Auto-updated May 18, 2026
Patch available.
generic
http://www.securityfocus.com/bid/102926
generic

WhatsNew - Mercurial

https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.4.1_.282017-11-07.29
generic

[Bug 5730] New: [CRITICAL]Arbitrary command execution in mercurial repo with a git submodule

https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-November/107333.html
generic Patch Available

[SECURITY] [DLA 2293-1] mercurial security update

https://lists.debian.org/debian-lts-announce/2020/07/msg00032.html
generic Patch Available

[SECURITY] [DLA 1414-2] mercurial regression update

https://lists.debian.org/debian-lts-announce/2018/07/msg00041.html
generic Patch Available

[SECURITY] [DLA 1414-1] mercurial security update

https://lists.debian.org/debian-lts-announce/2018/07/msg00005.html
generic Patch Available

[SECURITY] [DLA 1224-1] mercurial security update

https://lists.debian.org/debian-lts-announce/2017/12/msg00027.html
generic

Sourcetree Security Advisory 2018-01-24 | Sourcetree | Atlassian Support

https://confluence.atlassian.com/sourcetreekb/sourcetree-security-advisory-2018-01-24-942834324.html
generic

[CRITICAL]Arbitrary command execution in mercurial repo with a git submodule (#5730) · Issues · mercurial / mercurial-devel · GitLab

https://bz.mercurial-scm.org/show_bug.cgi?id=5730

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
mercurial0.8.1 ... 4.4rc0 (136 versions)4.4.1—

Data Freshness Timeline

(refreshed 8× in last 7d / 36× 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. 2026-07-11 08:24 UTCEPSS rescore
  2. 2026-07-09 19:06 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCOSV refresh
  4. 2026-07-08 15:10 UTCEPSS rescore
  5. 2026-07-07 13:42 UTCEPSS rescore
  6. 2026-07-06 16:24 UTCEPSS rescore
  7. 2026-07-06 02:20 UTCEPSS rescore
  8. 2026-07-05 02:27 UTCEPSS rescore
  9. 2026-07-04 06:28 UTCEPSS rescore
  10. 2026-07-01 15:02 UTCEPSS rescore
  11. 2026-07-01 15:02 UTCEPSS rescore
  12. 2026-06-30 23:19 UTCEPSS rescore
  13. 2026-06-30 23:19 UTCEPSS rescore
  14. 2026-06-29 14:03 UTCEPSS rescore
  15. 2026-06-28 14:04 UTCEPSS rescore
  16. 2026-06-28 04:53 UTCEPSS rescore
  17. 2026-06-27 03:05 UTCEPSS rescore
  18. 2026-06-25 13:47 UTCEPSS rescore
  19. 2026-06-25 13:47 UTCEPSS rescore
  20. 2026-06-24 14:02 UTCEPSS rescore
  21. 2026-06-23 21:30 UTCEPSS rescore
  22. 2026-06-22 14:23 UTCEPSS rescore
  23. 2026-06-22 14:23 UTCEPSS rescore
  24. 2026-06-21 14:54 UTCEPSS rescore
  25. 2026-06-21 14:54 UTCEPSS rescore
Show 56 more
  1. 2026-06-20 03:12 UTCOSV refresh
  2. 2026-06-19 19:23 UTCEPSS rescore
  3. 2026-06-19 19:23 UTCEPSS rescore
  4. 2026-06-18 17:50 UTCEPSS rescore
  5. 2026-06-17 17:50 UTCEPSS rescore
  6. 2026-06-16 17:50 UTCEPSS rescore
  7. 2026-06-15 17:45 UTCEPSS rescore
  8. 2026-06-14 23:14 UTCEPSS rescore
  9. 2026-06-14 23:14 UTCEPSS rescore
  10. 2026-06-13 22:57 UTCEPSS rescore
  11. 2026-06-12 23:09 UTCEPSS rescore
  12. 2026-06-11 13:57 UTCEPSS rescore
  13. 2026-06-10 22:15 UTCEPSS rescore
  14. 2026-06-08 14:14 UTCEPSS rescore
  15. 2026-06-07 15:22 UTCEPSS rescore
  16. 2026-06-07 15:22 UTCEPSS rescore
  17. 2026-06-06 13:45 UTCEPSS rescore
  18. 2026-06-06 13:45 UTCEPSS rescore
  19. 2026-06-05 22:44 UTCEPSS rescore
  20. 2026-06-05 06:08 UTCEPSS rescore
  21. 2026-06-05 06:08 UTCEPSS rescore
  22. 2026-06-04 13:10 UTCEPSS rescore
  23. 2026-06-04 13:10 UTCEPSS rescore
  24. 2026-06-02 20:11 UTCEPSS rescore
  25. 2026-06-02 20:11 UTCEPSS rescore
  26. 2026-06-01 13:49 UTCEPSS rescore
  27. 2026-06-01 13:49 UTCEPSS rescore
  28. 2026-05-31 22:28 UTCEPSS rescore
  29. 2026-05-31 04:25 UTCOSV refresh
  30. 2026-05-31 00:14 UTCEPSS rescore
  31. 2026-05-29 13:41 UTCEPSS rescore
  32. 2026-05-28 13:42 UTCEPSS rescore
  33. 2026-05-28 13:42 UTCEPSS rescore
  34. 2026-05-27 13:38 UTCEPSS rescore
  35. 2026-05-27 13:38 UTCEPSS rescore
  36. 2026-05-26 07:17 UTCEPSS rescore
  37. 2026-05-26 07:17 UTCEPSS rescore
  38. 2026-05-23 00:10 UTCEG score recompute
  39. 2026-05-22 21:15 UTCEPSS rescore
  40. 2026-05-22 21:15 UTCEPSS rescore
  41. 2026-05-22 21:15 UTCEPSS rescore
  42. 2026-05-20 22:37 UTCEPSS rescore
  43. 2026-05-20 22:37 UTCEPSS rescore
  44. 2026-05-20 11:21 UTCEPSS rescore
  45. 2026-05-20 11:21 UTCEPSS rescore
  46. 2026-05-20 11:10 UTCEG score recompute
  47. 2026-05-20 06:49 UTCEG score recompute
  48. 2026-05-20 02:28 UTCEG score recompute
  49. 2026-05-19 22:07 UTCEG score recompute
  50. 2026-05-19 17:46 UTCEG score recompute
  51. 2026-05-19 13:25 UTCEG score recompute
  52. 2026-05-19 09:03 UTCEG score recompute
  53. 2026-05-19 04:42 UTCEG score recompute
  54. 2026-05-19 00:21 UTCEG score recompute
  55. 2026-05-18 21:30 UTCEPSS rescore
  56. 2026-05-18 21:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2017-17458?
CVE-2017-17458 is a critical vulnerability published on December 7, 2017. In Mercurial before 4.4.1, it is possible that a specially malformed repository can cause Git subrepositories to run arbitrary code in the form of a .git/hooks/post-update script checked into the repository. Typical use of Mercurial prevents construction of such repositories, but they can be…
When was CVE-2017-17458 disclosed?
CVE-2017-17458 was first published in the National Vulnerability Database on December 7, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-17458 actively exploited?
CVE-2017-17458 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-17458?
CVE-2017-17458 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-17458?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-17458, 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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