CVE-2019-5435: curl Incorrect Calculation of Buffer Size
CVSS: 4.3v2.0MediumModified
AliasesALPINE-CVE-2019-5435DEBIAN-CVE-2019-5435
Published 28-05-2019Last modified 14-10-2026
Vulnerability summary
CVE-2019-5435 is a medium (CVSS 4.3) Incorrect Calculation of Buffer Size vulnerability in curl. EPSS estimates a 5.66% chance of exploitation in the next 30 days, higher than 92.8% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
4.3/10
010
Medium · v2.0 (NVD)EPSS score
5.66%
0%100%
Low · +0.95 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 3 · Related 1Timeline
- 28-05-2019PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
An integer overflow in curl's URL API results in a buffer overflow in libcurl 7.62.0 to and including 7.64.1.
CVSS metrics
4 scores · 3 sources · 2 versionsLow 3.7Preferred score · OSV · Alpine (Ecosystem advisory) · calculated from vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LSourcesAll 3 agree
- OSV · DebianEcosystem advisory · calculated3.7LowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- NVDNIST3.7LowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
5.66%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
+0.95 pp
From 4.71% on 19-09-2026
19-09-202619-10-2026
EPSS score5.66%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (curl.haxx.se)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-131Incorrect Calculation of Buffer SizeThe product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
- CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
Affected systems
Alpine1 product
- curl≥ 7.62.0, < 7.65.0-r0 | ≥ 7.62.0, < 7.64.0-r2
Curl1 product
- curlFixed in 7.65.0
Debian1 product
- curl< 7.64.0-4
Haxx1 product
- curl≥ 7.62.0, ≤ 7.64.1
4 vendors · 4 products
References
11 links- www.oracle.com/security-alerts/cpuapr2020.htmlX Refsource MISC
- www.oracle.com/security-alerts/cpuoct2020.htmlX Refsource MISC
- security.netapp.com/advisory/ntap-20190606-0004/X Refsource CONFIRM
- support.f5.com/csp/article/K08125515X Refsource CONFIRM
